Decrease Subtract Minus Take from Reduce Subtrahend L ess Subtraction Calculation subtract equals minuend subtrahend difference 9 3 6 Real L ID: 621593
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Slide1Slide2
Difference
Decrease
Subtract
Minus
Take from
Reduce
Subtrahend
L
essSlide3
Subtraction Calculation
subtract equals minuend subtrahend difference
9 – 3 = 6Slide4
Real Life Subtraction
Use real life every day situations, drawing children’s attention to every day situations that show subtraction. E.g: Giving milk out, seeing the cartons be taken away, how many left?
Having a bowl of ten sweets, how many have you eaten? How many are left? If you give me one how many are left?Slide5
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8
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10 green bottles
9
green bottles
8
green bottles
7
green bottles
6 green bottles
5
green bottles
4
green bottles
3
green bottles
2
green bottles
1 green
bottle
No
green bottles
Subtracting through songsSlide6
One less
Can you take one away? How many are left?
So, one less than seven is six.Slide7
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11 12 13 14 15 16 17 18 19
2
0
Vocabulary
Less
Problem:
What is one less than 9?
1 lessSlide8
8-4=4
5-2=3
Subtraction with objectsSlide9
5-4=1
First I start with 5 fingers
I then put 4 down. This will then give me 1.
Subtracting using fingersSlide10
Number Bonds
Additions
Subtractions
10+0=10
0+10=10
10-0=10
10-10=0
9+1=10
1+9=10
10-1=9
10-9=1
8+2=102+8=1010-2=8
10-8=27+3=103+7=1010-3=7
10-7=36+4=104+6=10
10-4=610-6=4
5+5=105+5=1010-5=5
10-5=5Slide11
Additions
Subtractions
1+0=10+1=1
1-0=11-1=02+0=2
0+2=2
2-0=2
2-2=0
1+1=2
1+1=22-1=12-1=13+0=30+3=33-0=3
3-3=02+1=31+2=33-2=13-1=24+0=40+4=4
4-0=44-4=03+1=41+3=44-1=34-3=12+2=4
2+2=44-2=24-2=2Slide12
Additions
Subtractions
5+0=50+5=5
5-0=55-5=04+1=5
1+4=5
5-1=4
5-4=1
3+2=5
2+3=55-2=35-3=26+0=60+6=66-0=6
6-6=05+1=61+5=66-1=56-5=14+2=62+4=6
6-2=46-4=23+3=63+3=66-3=36-3=37+0=7
0+7=77-0=77-7=06+1=71+6=77-1=6
7-6=15+2=72+5=77-2=57-5=23+4=74+3=7
7-3=47-4=3Slide13
Additions
Subtractions
8+0=80+8=8
8-0=88-8=07+1=8
1+7=8
8-1=7
8-7=1
6+2=8
2+6=88-2=68-6=25+3=83+5=88-3=5
8-5=34+4=84+4=88-4=48-4=49+0=90+9=9
9-0=99-9=18+1=91+8=99-1=89-8=17+2=9
2+7=99-2=79-7=26+3=93+6=99-3=6
9-6=35+4=94+5=99-4=59-5=4Slide14
Counting Back
Subtracting by counting back using a number line.Slide15
Subtracting by
counting back mentally
7 – 1 = 6
10 – 2 =
8
25 – 5 = 20
100 – 10 =90Slide16
Subtract a 1-digit number from a
2-
digit number
17 – 5 =
24 – 3 =
16 – 6 =
23 – 7 =Slide17
Subtracting by
counting up
14 – 12 = 2
12
14
+2 Slide18
30
9
20
3
First subtract your tens.
30-20=10
Then your ones
9-3=6
Finally recombine
10+6=16
Partitioning
39 – 23 =Slide19
Subtracting 10 from
multiples of 10
+ 10Slide20
To count back in tens you need to know your 10 times tables
10,20,30,40,50,60,70,80,90,100,110 & 120.
10
10
10
10
10
90-50=
Subtracting by counting
b
ack in 10s
90 – 50 = 40Slide21
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100
When subtracting 10 you count back ten squares from your starting number.
Or you can jump to the number directly above.
Subtracting 10 using a number square
Now try 56-10=
Make some up yourself.
2
7 – 10 = 17Slide22
68-40=28
-10
-10
-10
-10
Ones remain the same.
Counting back in 10s Slide23
46-10=36
36+1=37
First subtract 10
Then add 1
Subtracting 9 by subtracting
10 and adjusting.
46 - 9Slide24
Subtracting 100
468 – 100 = 368
987 – 100 =887
635 – 100 = 535
1,786 – 100 = 1,686
What do you notice?Slide25
49-36=
This question can be worked out quickly by using a number line and counting up.
36
49
40
4+9=13
.
Finding the difference by
c
ounting up.
+4
+9Slide26
127-100=27
27+5=32
First subtract 100
Then add 5
How to calculate
127 – 95=
Can you use this method to subtract 96? 93?Slide27
95
100
120
127
+5
+20
+7
Another method:
127 – 95 = 32
5+20+7= 32Slide28
300+
1
80+7
200+ 90+4 0+90+3
=93
387
294
93
When you partition, it is easier to see that you borrow from the hundreds column.
387 – 294 = 93
200Slide29
4621
-
730
3891
5
1
3
Tip
-Always start at the right and make sure your larger number is on the top.
3.Again 500-700 is not possible to do without borrowing. So borrow from neighbour (left), the thousands column, which will then make your number 1500. 1500-700=800
2. Next you look at the tens column 20 - 30.
This is not possible to do without borrowing one from your neighbour (left side), the hundreds. After borrowing one hundred it will make your number into 120. 120-30=90
4.Finally you are left with a 3 in the thousands column. Below there is no number to take away so you just take zero away.
3000 - 0=3000
1
1. First you start with the ones column 1-0=1.
Subtraction by decompositionSlide30
£ 14.71
7.89
£ 6.82
3
1
1
6
0
1
Subtraction of decimals
Remember to line your decimals up like shirt buttons!